CN208862088U - A kind of electrodes of lithium-ion batteries - Google Patents
A kind of electrodes of lithium-ion batteries Download PDFInfo
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- CN208862088U CN208862088U CN201821431485.XU CN201821431485U CN208862088U CN 208862088 U CN208862088 U CN 208862088U CN 201821431485 U CN201821431485 U CN 201821431485U CN 208862088 U CN208862088 U CN 208862088U
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- Prior art keywords
- pole piece
- lithium
- electrodes
- substrate
- ion batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Secondary Cells (AREA)
Abstract
The utility model provides a kind of electrodes of lithium-ion batteries, and including substrate, coating layer of active substance and the tab being arranged on pole piece, coating layer of active substance is coated in the wherein one side of substrate, and the another side of substrate is provided with buffer layer；Buffer layer includes multiple spring structures, and spring structure one end is fixed on substrate, and one end is free end；The flexible deformation direction of spring structure is perpendicular to substrate.The battery pole piece of the utility model sufficiently discharges stress after cold pressing, and the steric effect between spring can effectively prevent pole piece clot；It restores to the original state after compression, release when spring structure is pressurized, forms the buffer layer that porosity is high, can store electrolyte, buffer layer is squeezed slow release electrolyte in cyclic process, supplements the consumption of electrolyte, to extend the cycle life of battery core.Spring structure forms impression when being cold-pressed on pole piece, these impressions increase the roughness of pole piece, is conducive to the imbibition ability for improving pole piece, electrodes of lithium-ion batteries structure is simple, can be mass.
Description
Technical field
The utility model belongs to battery technology field more particularly to a kind of electrodes of lithium-ion batteries.
Background technique
Requirement with countries in the world to energy-saving and environmental protection is continuously improved, and new-energy automobile will gradually substitute conventional fuel oil
Automobile becomes the leading role of automobile industry, and automobile power cell will be the key that new-energy automobile development.In order to meet low internal resistance
Requirement, most producers use lamination process.Since single side pole piece can discharge stress after cold pressing, pole piece clot is caused, seriously
Lamination production is influenced, therefore in the actual production process, outermost two layers generally using two-sided pole piece, i.e., outermost two layers of active material
Coating is not utilized.Such way not only waste active material, occupy cell thickness, while also can Electolyte-absorptive, but absorb
Electrolyte to cycle performance of battery, there is no improvement results.
Patent CN 105810884A discloses a kind of drawing method of pole piece, i.e., the pole piece after being cold-pressed first time carries out
Solvent vapo(u)r infiltration, carries out second of cold pressing after dry again.The method can reduce answering in pole piece after cold pressing to a certain extent
Power, but the solvent vapo(u)r used is mostly inflammable, toxic gas, is unfavorable for environmental protection, and security risk is larger, is unfavorable for extensive
Production.
In consideration of it, it is necessary to for stress release after the cold pressing of existing single side pole piece, and cause pole piece clot that can not be folded
The problem of piece, develops a kind of pole piece that can prevent clot.
Utility model content
Aiming at the problem that stress release causes pole piece clot that can not carry out lamination after the cold pressing of existing single side pole piece, this is practical new
Type provides a kind of electrodes of lithium-ion batteries that can prevent clot.
A kind of electrodes of lithium-ion batteries, including substrate, coating layer of active substance and the tab being arranged on pole piece, the activity
Matter coatings are coated in the wherein one side of the substrate, and the another side of the substrate is provided with buffer layer.
Further, the buffer layer includes multiple spring structures, and described spring structure one end is fixed on the substrate,
One end is free end.
Further, the flexible deformation direction of the spring structure is perpendicular to the substrate.
Further, the gap between two adjacent spring structures is 0.01~0.1 μm.
Further, the spring structure is cylindrical, cone or concave spring.
Further, the height of the spring structure in a free state is 5~60 μm, and diameter is 1~15 μm.
Further, the multiple spring structure is in arranged in parallel.
Further, the spring structure is rubber or carbon nanomaterial.
Further, the width of the coating layer of active substance of the width of the buffer layer, length and pole piece another side, length one
It causes.
Further, the pole piece is used for anode pole piece or cathode pole piece.
The utility model has the beneficial effects that
The utility model is provided with buffer layer in the pole piece another side of single side coating coating layer of active substance, and buffer layer can be effective
The stress generated after release cold pressing is conducive to inhibit pole piece clot.
The buffer layer of the utility model is made of numerous spring structures perpendicular to substrate, the steric hindrance effect between spring structure
It can should effectively prevent pole piece clot.
The spring structure of the utility model height in a free state and diameter setting can sufficiently discharge stress, avoid pole
Piece clot, and there is safe deformation height.
The spring structure of the utility model is compressible when being pressurized, and can restore to the original state after pressure release, and the porosity of formation is high,
Electrolyte can be stored, being squeezed in cyclic process can be with slow release electrolyte, and electrolyte disappears in supplement cyclic process
Consumption, so as to extend the cycle life of battery core.
The spring structure of the utility model helps to form impression on pole piece when cold pressing, these impressions can increase pole piece
The roughness on surface is conducive to the imbibition ability for improving pole piece.
The spring structure of the utility model uses rubber or carbon nanomaterial, and it is either physically or chemically stable to be conducive to use
Preparation has good release stress ability on substrate.
The electrodes of lithium-ion batteries structure of the utility model is simple, can be mass.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is sectional view of the utility model using the pole piece structure of cylindrical spring structure；
Fig. 2 is sectional view of the utility model using the pole piece structure of cone shaped spring structure；
Fig. 3 is sectional view of the utility model using the pole piece structure of concave spring structure；
Fig. 4 is the top view of the utility model pole piece structure；
Fig. 5 is the sectional view of the utility model pole piece heap poststack；
Fig. 6 is to compare using the utility model pole piece and not using the battery core high temperature cyclic performance of the utility model pole piece
Figure.
Appended drawing reference in above-mentioned figure:
1, buffer layer, 2, substrate, 3, coating layer of active substance, 4, tab, 5, spring structure, 6, novel cathode pole piece, 7, often
Advise anode pole piece, 8, conventional anode pole piece.
Specific embodiment
In order to be more clear the purpose of this utility model, technical solution and advantageous effects, below in conjunction with attached drawing and
Embodiment, the present invention will be further described in detail.It should be understood that embodiment described in this specification is only
Merely to explaining the utility model, it is not intended to limitation the utility model.
As shown in Figures 1 to 4, the electrodes of lithium-ion batteries of the utility model, including substrate 2, coating layer of active substance 3 and set
The tab 4 on pole piece is set, coating layer of active substance 3 is coated in the wherein one side of substrate 2, and the another side of substrate 2 is provided with slow
Layer 1 is rushed, buffer layer 1 can be released effectively the stress generated after cold pressing, be conducive to inhibit pole piece clot.
Buffer layer 1 includes multiple spring structures 5, and 5 one end of spring structure is fixed on substrate 2, and one end is free end, spring
The flexible deformation direction of structure 5 is perpendicular to substrate 2, and the gap between two adjacent spring structures 5 is 0.05 μm, the spring
The height of structure 5 in a free state is 40 μm, and diameter is 6 μm, and the steric effect between spring structure 5 effectively can prevent pole piece from beating
Volume, and there is safe deformation height.Spring structure 5 is compressible when being pressurized, and can restore to the original state after pressure release, the porosity of formation
Height, can store electrolyte, and electrolyte in cyclic process can be supplemented with slow release electrolyte by being squeezed in cyclic process
Consumption, so as to extend the cycle life of battery core.
Multiple spring structures 5 are arranged in parallel, are helical spring, and the spring structure 5 is rubber or carbon nanomaterial, institute
Width, the length for stating buffer layer 1 are consistent with the width of the coating layer of active substance 3 of pole piece another side, length, and the pole piece can be used for
Anode pole piece or cathode pole piece.Spring structure 5 helps to form impression on pole piece when cold pressing, these impressions can increase pole piece
The roughness on surface is conducive to the imbibition ability for improving pole piece.Spring structure 5 uses rubber or carbon nanomaterial, is conducive to adopt
There is good release stress ability on substrate 2 with either physically or chemically stable preparation.
The electrodes of lithium-ion batteries structure of the utility model is simple, can be mass.
As shown in figure 5, the conventional cathode pole piece 7 being coated with by the novel cathode pole piece 6 of the utility model and according to a conventional method,
Folded core (Fig. 5 septation does not indicate) is made according to the method for stacking in conventional anode pole piece 8 and diaphragm, according to normal process system
At finished product battery core.Due to shrinkable after the compression of spring structure 5 in buffer layer 1, and between spring structure 5 and adjacent springs structure
Gap there are numerous holes, electrolyte can be stored, battery core releasable electrolyte after circulation is pressurized improves battery core cyclicity
Energy.Further, since spring structure 5 has certain height after being pressurized, when cold pressing, can form impression on pole piece, these impressions can
To increase the roughness of pole piece, be conducive to the imbibition ability for improving pole piece.
Performance test
By the existing battery core of the Novel electric core prepared in the utility model and not set buffer layer under the conditions of 45 ± 3 DEG C into
Row 1C/1C loop test, records the capacity retention ratio of battery core, test results are shown in figure 6.It can be with from the comparing result of Fig. 6
Find out, relative to the existing battery core of not set buffer layer, the Novel electric core prepared in the utility model has the preferably circulation longevity
Life, after circulation 700 times, capacity retention ratio still can achieve 92.1%, and the existing battery core capacity of not set buffer layer
Conservation rate only has 86.7%.
It can be seen that and compare with contrast test in conjunction with the embodiment above to the Novel electric core prepared in the utility model
In the prior art, the electrodes of lithium-ion batteries of the utility model has the advantages that the steric hindrance in buffer layer between spring structure
Pole piece clot caused by stress release after effect can effectively prevent pole piece from being cold-pressed, and spring structure can after being pressurized in buffer layer
It shrinks, and there are numerous holes for the gap between spring structure and adjacent springs structure, can store electrolyte, battery core is being followed
Releasable electrolyte after ring is pressurized improves battery core cycle performance.Further, since spring structure has certain height after being pressurized,
Impression can be formed when cold pressing on pole piece, these impressions can increase the roughness of pole piece, be conducive to the suction for improving pole piece
Liquid ability.
The foregoing describe basic principles, main features, and advantages of the present invention.The skill of the industry
Art personnel it should be appreciated that the present utility model is not limited to the above embodiments, what is described in the above embodiment and the description is only
Illustrate the principles of the present invention, the utility model also has various on the premise of not departing from the spirit and scope of the utility model
Changes and improvements, these various changes and improvements fall within the scope of the claimed invention.The requires of the utility model protection
Range is defined by appended claims and its equivalent.
Claims (9)
1. a kind of electrodes of lithium-ion batteries, which is characterized in that including substrate, coating layer of active substance and the pole being arranged on pole piece
Ear, the coating layer of active substance are coated in the wherein one side of the substrate, and the another side of the substrate is provided with buffer layer, institute
Stating buffer layer includes multiple spring structures, and described spring structure one end is fixed on the substrate, and one end is free end.
2. electrodes of lithium-ion batteries according to claim 1, which is characterized in that the flexible deformation direction of the spring structure
Perpendicular to the substrate.
3. electrodes of lithium-ion batteries according to claim 1, which is characterized in that between two adjacent spring structures
Gap be 0.01~0.1 μm.
4. electrodes of lithium-ion batteries according to claim 1, which is characterized in that the spring structure is cylindrical, circular cone
Shape or concave spring.
5. electrodes of lithium-ion batteries according to claim 1, which is characterized in that the spring structure is in a free state
Height is 5~60 μm, and diameter is 1~15 μm.
6. electrodes of lithium-ion batteries according to claim 1, which is characterized in that the multiple spring structure is in parallel
Column.
7. electrodes of lithium-ion batteries according to claim 1, which is characterized in that the spring structure is rubber or carbon nanometer
Material.
8. electrodes of lithium-ion batteries according to claim 1, which is characterized in that width, length and the pole of the buffer layer
The width of the coating layer of active substance of piece another side, length are consistent.
9. electrodes of lithium-ion batteries according to claim 1, which is characterized in that the pole piece is used for anode pole piece or cathode
Pole piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821431485.XU CN208862088U (en) | 2018-09-03 | 2018-09-03 | A kind of electrodes of lithium-ion batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821431485.XU CN208862088U (en) | 2018-09-03 | 2018-09-03 | A kind of electrodes of lithium-ion batteries |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208862088U true CN208862088U (en) | 2019-05-14 |
Family
ID=66416646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821431485.XU Active CN208862088U (en) | 2018-09-03 | 2018-09-03 | A kind of electrodes of lithium-ion batteries |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208862088U (en) |
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2018
- 2018-09-03 CN CN201821431485.XU patent/CN208862088U/en active Active
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| GR01 | Patent grant | ||
| PP01 | Preservation of patent right | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20230426 Granted publication date: 20190514 |